How to search for a string inside an array of strings

Question

After searching for an answer in other posts  I felt I have to ask this  I looked at How do I check if an array includes an object in JavaScript  and Best way to find if an item is in a JavaScript array  and couldn t get the code there to work   I am capturing an html embed code into an array  so each item is a line of html code   for example     i 0    lt param name   bgcolor   value    FFFFFF     gt   i 1    lt param name   width  value   640     gt   i 2    lt param name   height   value   360     gt      i 3   more html code     I want to search this array and find the line where the word  height  is   So ideally  I d like to write a function that returns the index of the item where  height  appears   Fortunately  there are no duplicates in this array  so there s only one occurrence   with simple object search I get  false  returns   Any idea

User · Answer

In-case if someone wants a little dynamic search.

 let searchInArray=(searchQuery, array, objectKey=null)=>{

  return array.filter(d=>{
      let data =objectKey? d[objectKey] : d //Incase If It's Array Of Objects.
       let dataWords= typeof data=="string" && data?.split(" ")?.map(b=>b&&b.toLowerCase().trim()).filter(b=>b)
      let searchWords = typeof searchQuery=="string"&&searchQuery?.split(" ").map(b=>b&&b.toLowerCase().trim()).filter(b=>b)

     let matchingWords = searchWords.filter(word=>dataWords.includes(word))

    return matchingWords.length

})
    
    
}

For an Array of strings:

let arrayOfStr = [
  "Search for words",
  "inside an array",
  "dynamic searching",
  "match rate 90%"
]

searchInArray("dynamic search", arrayOfStr)

//Results: [ "Search for words", "dynamic searching" ]

For an Array of Objects:

let arrayOfObject = [
  {
    "address": "Karachi Pakistan"
  },
  {
    "address": "UK London"
  },
  {
    "address": "Pakistan Lahore"
  }
]

searchInArray("Pakistan", arrayOfObject,"address")

//Results: [ { "address": "Karachi Pakistan" }, { "address": "Pakistan Lahore" } ]

User · Answer

It s faster to avoid using regular expressions  if you re just trying to find the first substring match within an array of string values  You can add your own array searching function   Code   Array prototype findFirstSubstring   function s                for var i   0  i  lt  this length i                                  if this i  indexOf s      -1                      return i                            return -1               Usage   i findFirstSubstring  height      Returns   -1 if not found or the array index of the first substring occurrence if it is found  in your case would be 2

User · Answer

It s as simple as iterating the array and looking for the regexp  function searchStringInArray  str  strArray        for  var j 0  j lt strArray length  j              if  strArray j  match str   return j            return -1      Edit - make str as an argument to function

User · Answer

You can use Array prototype find function in javascript  Array find MDN   So to find string in array of string  the code becomes very simple  Plus as browser implementation  it will provide good performance   Ex   var strs     abc    def    ghi    jkl    mno    var value    abc   strs find      function str            return str    value             or using lambda expression it will become much shorter  var strs     abc    def    ghi    jkl    mno    var value    abc   strs find  str    gt  str     value

User · Answer

Extending the contains function you linked to   containsRegex a  regex     for var i   0  i  lt  a length  i          if a i  search regex   gt  -1         return i              return -1      Then you call the function with an array of strings and a regex  in your case to look for height   containsRegex     lt param name   bgcolor   value    FFFFFF     gt     sdafkdf      height     You could additionally also return the index where height was found   containsRegex a  regex     for var i   0  i  lt  a length  i          int pos   a i  search regex       if pos  gt  -1         return  i  pos               return null

[javascript] How to search for a string inside an array of strings

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